1 8 EDUCATIONAL BOOKS. 



adopted^ the teacher finds a difficulty in giving to each sufficient attention. 

 A judicious combination of both methods is doubtless the best ; and it is 

 hoped that this result may be arrived at in some degree by the use of this 

 book, which is simply a collection of examples, with helps for solution, 

 arranged in progressive sections. 



Ferrers. AN ELEMENTARY TREATISE ON TRILINEAR 



CO-ORDINATES, the Method of Reciprocal Polars, and the 

 Theory of Projectors. By the Rev. N. M. FERRERS, M. A., Fellow 

 and Tutor of Gonville and Caius College, Cambridge. Second 

 Edition. Crown 8vo. 6j. 6d. 



The object of the author in writing on this subject has mainly been to 

 place it on a basis altogether independent of the ordinary Cartesian system, 

 instead of regarding it as only a special form of Abridged Notation. 

 A short chapter on Determinants has been introduced. 



Frost. THE FIRST THREE SECTIONS OF NEWTON'S 

 PRINCIPIA. With Notes and Illustrations. Also a collection oi 

 Problems, principally intended as Examples of Newton's Methods. 

 By PERCIVAL FROST, M.A., late Fellow of St. John's College, 

 Mathematical Lecturer of King's College, Cambridge. Second 

 Edition. 8vo. cloth. I Of. &/. 



The author's principal intention is to explain difficulties which may be 

 encountered by the student on first reading the Principia, and to illustrate 

 the advantages of a careful study of the methods employed by Newton, by 

 showing the extent to which they may be applied in the solution of problems ; 

 he has also endeavoured to give assistance to the student who is engaged in 

 the study of the higher branches of mathematics, by representing in a 

 geometrical form several of the processes employed in the Differential and 

 Integral Calculus, and in the analytical investigations oj Dynamics. 



Frost and Wolstenholme. A TREATISE ON SOLID 

 GEOMETRY. By PERCIVAL FROST, M.A., and the Rev. J. 

 WOLSTENHOLME, M.A., Fellow and Assistant Tutor of Christ's 

 College. 8vo. cloth. l8j. 



